MySQL implements the batch modification function of the ordering system

MySQL implements the batch modification function of the ordering system, which requires specific code examples

In the ordering system, sometimes it is necessary to batch modify orders or dishes to improve Operational efficiency and user experience. As a relational database management system, MySQL provides powerful functions to support batch modification operations. This article will introduce how to use MySQL to implement the batch modification function of the ordering system, and give relevant code examples.

1. Create database and tables

First, we need to create a database containing order and dish information, and create corresponding tables in it. Suppose our database is named order_system and has two tables: orders and dishes.

The orders table contains the following fields: order_id, user_id, total_price, status.

dishes table contains the following fields: dish_id, dish_name, price, stock.

Fields can be added or reduced according to actual needs.

The specific database and table creation statements are as follows:

CREATE DATABASE order_system; USE order_system; CREATE TABLE orders ( order_id INT PRIMARY KEY AUTO_INCREMENT, user_id INT, total_price DECIMAL(10, 2), status INT ); CREATE TABLE dishes ( dish_id INT PRIMARY KEY AUTO_INCREMENT, dish_name VARCHAR(100), price DECIMAL(10, 2), stock INT );

2. Insert test data

In order to demonstrate the batch modification function, we need to insert some test data . Insert the following data in the orders table:

INSERT INTO orders (user_id, total_price, status) VALUES (1, 50.00, 0), (2, 30.00, 1), (3, 80.00, 0);

Insert the following data in the dishes table:

INSERT INTO dishes (dish_name, price, stock) VALUES ('麻辣烫', 15.00, 100), ('宫保鸡丁', 25.00, 50), ('水煮鱼', 35.00, 30);

3. Batch modification function code example

Assume that now we You need to change the status of all orders with a status of 0 in the orders table to 1, and change the stock of all dishes with a stock less than 10 in the dishes table to 20.

The following is a MySQL code example:

USE order_system; -- 修改orders表格中的status UPDATE orders SET status = 1 WHERE status = 0; -- 修改dishes表格中的stock UPDATE dishes SET stock = 20 WHERE stock < 10;

The above code first uses the USE keyword to select the order_system database, and then uses the UPDATE keyword to update the orders and dishes tables respectively. The WHERE conditions can be modified according to actual needs to meet different batch modification needs.

Summary:

This article introduces how to use MySQL to implement the batch modification function of the ordering system, and gives relevant code examples. By creating databases and tables, inserting test data, and using UPDATE statements to perform batch modification operations, batch modification requirements in the ordering system can be easily realized. Readers can modify and expand it according to the actual situation to meet their specific needs.

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